Porting ASM Runners
Thread Starter
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
Porting ASM Runners
I want to build a 383 this winter, so I know I'm gonna need some aftermarket/porting done. I want to stay TPI
I already have the ASM's.
I am going to buy an aftermarket base and have that ported
And get a plenum from Corvetteplenum.com
Would it be best to have the ASM's siamesed?
Anybody know someone who ports? I know cuisinartvette does, but i don't know if he does runners.
I already have the ASM's.
I am going to buy an aftermarket base and have that ported
And get a plenum from Corvetteplenum.com
Would it be best to have the ASM's siamesed?
Anybody know someone who ports? I know cuisinartvette does, but i don't know if he does runners.
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
Le Mans Master
Joined: Jul 2007
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From: Tampa Florida
Burning Brakes
Joined: Feb 2002
Posts: 804
Likes: 5
From: Fresno CA
If you want the runners opened up all the way through I would suggest Extrude Hone:
http://www.extrudehone.com/
I have had them do a couple intakes for me including a Dodge Viper intake and heads and the process is very good. Because the process uses an abrasive media, it is not selective as to where it removes the material but rather it removes it evenly throughout the runner or port so if you need a specific area addressed like changing a radius in a head, you will have to do that by hand first and then Extrude Hone once you are finished. For intakes with areas that are nearly impossible to get to and accurately open up Extrude Hone is the way to go. I haven't sent them anything in a couple years and it looks like they are owned by Kennemetal so I don't know if anything's changed, you will probably have to call them directly.
http://www.extrudehone.com/
I have had them do a couple intakes for me including a Dodge Viper intake and heads and the process is very good. Because the process uses an abrasive media, it is not selective as to where it removes the material but rather it removes it evenly throughout the runner or port so if you need a specific area addressed like changing a radius in a head, you will have to do that by hand first and then Extrude Hone once you are finished. For intakes with areas that are nearly impossible to get to and accurately open up Extrude Hone is the way to go. I haven't sent them anything in a couple years and it looks like they are owned by Kennemetal so I don't know if anything's changed, you will probably have to call them directly.
Race Director
Joined: Jun 2004
Posts: 13,924
Likes: 700
From: WI
I don't understand how your going to port those runners. They are paper thin. You might be able to notch into the flange a little bit with some siamese work.
I also don't understand how the Corvetteplenum.com piece is different from the ported one you already have. It's a little rough but would be easy to smooth the port edges to runners.
The big base idea is good!
Are you going to use your short block? If not, I'll run it in mine when it blows.
I also don't understand how the Corvetteplenum.com piece is different from the ported one you already have. It's a little rough but would be easy to smooth the port edges to runners.
The big base idea is good!
Are you going to use your short block? If not, I'll run it in mine when it blows.
Burning Brakes
Joined: Jan 2003
Posts: 755
Likes: 32
From: Roswell Georgia
Concur with Aardwolf's assessment. ASM's runners are thin-wall tubing - they are not cast aluminum like other big runners nor are they siamesed like most cast runners. They flow quite well as is and should support your 383 with a ported, aftermarket manifold.
Team Owner
Joined: Dec 2007
Posts: 20,974
Likes: 261
First off, maybe look at a first system, or some different options IMHO.
I would focus on the motor, and worry about intake later. by the time you build a motor you might be able to have a better intake, or your plan might change.
I think by now you know LTR TPI set up is not a performance set up. I think if you are talking 383 you are talking at least superram if not HSR or mini ram. The LTR TPI in my mind robs or defeats the purpose of a bigger built motor. for those who speak of torque loss, look at HOLESHOT"s video of his 85' on youtube, with 383 miniram.( he also has gears though)
http://www.youtube.com/watch?v=B029yiXR2Hs
I would focus on the motor, and worry about intake later. by the time you build a motor you might be able to have a better intake, or your plan might change.
I think by now you know LTR TPI set up is not a performance set up. I think if you are talking 383 you are talking at least superram if not HSR or mini ram. The LTR TPI in my mind robs or defeats the purpose of a bigger built motor. for those who speak of torque loss, look at HOLESHOT"s video of his 85' on youtube, with 383 miniram.( he also has gears though)
http://www.youtube.com/watch?v=B029yiXR2Hs
Last edited by pologreen1; Sep 26, 2009 at 08:29 PM.
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"The LTR TPI in my mind robs or defeats the purpose of a bigger built motor. for those who speak of torque loss, look at HOLESHOT"s video of his 85' on youtube, with 383 miniram.( he also has gears though"
exactly my thoughts.
exactly my thoughts.
Safety Car
Joined: Jul 2008
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From: Made In America
St. Jude Donor '10-'11
383 TPI with Roller rockers, cam/heads, chip, bigger injectors, headers true duals, high flow cats, free flowing mufflers, Ported to the max asm runners/aftermarket base/plenum, slp cold air intake, and a better cooling system, you will have a bad *** motor in the lower-mid RPMs. The other set ups are for high RPMs. Honestly are you really going to obe hitting 5000 or more RPMs on a street car? Nope. Make the TPI the best you can. Get a good tune like from PCMFORLESS when your mods are all done and tear some tires up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
Team Owner
Joined: Dec 2007
Posts: 20,974
Likes: 261
383 TPI with Roller rockers, cam/heads, chip, bigger injectors, headers true duals, high flow cats, free flowing mufflers, Ported to the max asm runners/aftermarket base/plenum, slp cold air intake, and a better cooling system, you will have a bad *** motor in the lower-mid RPMs. The other set ups are for high RPMs. Honestly are you really going to obe hitting 5000 or more RPMs on a street car? Nope. Make the TPI the best you can. Get a good tune like from PCMFORLESS when your mods are all done and tear some tires up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
that mini ram video shows he can burn robber no problem, and he will clean any LTR set ups clock under any circumstance even under 6k.
Thread Starter
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
I don't understand how your going to port those runners. They are paper thin. You might be able to notch into the flange a little bit with some siamese work.
I also don't understand how the Corvetteplenum.com piece is different from the ported one you already have. It's a little rough but would be easy to smooth the port edges to runners.
The big base idea is good!
Are you going to use your short block? If not, I'll run it in mine when it blows.
I also don't understand how the Corvetteplenum.com piece is different from the ported one you already have. It's a little rough but would be easy to smooth the port edges to runners.
The big base idea is good!
Are you going to use your short block? If not, I'll run it in mine when it blows.
383 TPI with Roller rockers, cam/heads, chip, bigger injectors, headers true duals, high flow cats, free flowing mufflers, Ported to the max asm runners/aftermarket base/plenum, slp cold air intake, and a better cooling system, you will have a bad *** motor in the lower-mid RPMs. The other set ups are for high RPMs. Honestly are you really going to obe hitting 5000 or more RPMs on a street car? Nope. Make the TPI the best you can. Get a good tune like from PCMFORLESS when your mods are all done and tear some tires up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
Almost forgot, get a D44 with gears. Expensive yes, but I am aiming for that set up.
It is going to be a street car. I don't know about the SLP intake...no cats either
I eventually want to supercharge it, but that's going to be like 10 years down the road. I figure if I can donate plasma to make an extra 200 dollars a month and put it ALL towards a blower, I can have a supercharger kit in about.....25-30 months. NOT BAD!!
I think the only way to have the ASM's ported is going to be extrude honing. Has anybody ever done this? It sounds expensive...
Last edited by Pwnage1337; Sep 27, 2009 at 12:50 AM.
Drifting
Joined: May 2002
Posts: 1,509
Likes: 3
From: Hazel Park MI
Eh man, those boys are right - AS&M are thin. I could only get 1/4" on the top & bottom siamesed, and when i tried to go a little further on the bottom flange of one runner, I had to add a little permatex to it (made a hole). All is well as they are not a vacuum leak source, but they are way more thin than stock, for sure.
Team Owner
Joined: Dec 2007
Posts: 20,974
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I am not going to be using my stock shortblock. There is someone local selling a bored/stroker clearanced block for 175 dollars. Cheaper than having my original block bored/hot tanked/clearanced.
You just read my mind.
It is going to be a street car. I don't know about the SLP intake...no cats either
I eventually want to supercharge it, but that's going to be like 10 years down the road. I figure if I can donate plasma to make an extra 200 dollars a month and put it ALL towards a blower, I can have a supercharger kit in about.....25-30 months. NOT BAD!!
I think the only way to have the ASM's ported is going to be extrude honing. Has anybody ever done this? It sounds expensive...
You just read my mind.
It is going to be a street car. I don't know about the SLP intake...no cats either
I eventually want to supercharge it, but that's going to be like 10 years down the road. I figure if I can donate plasma to make an extra 200 dollars a month and put it ALL towards a blower, I can have a supercharger kit in about.....25-30 months. NOT BAD!!
I think the only way to have the ASM's ported is going to be extrude honing. Has anybody ever done this? It sounds expensive...
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
i learned the hard way to stay away from LTR setups,i got a Super Ram and i dont discard a MR unit if i build a 383 or a 421 down the road.-
oh ..and im a street driver but i want to be capable of beat some azz on the track as well
oh ..and im a street driver but i want to be capable of beat some azz on the track as well
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
